Founded in 1743, the APS began as a small organization. Toward the end of the 18th century, however, the Society went through a period of significant expansion. By 1800, over 600 Members had been elected. They included experts in fields as diverse as geography, math, astronomy, medicine, natural history, commerce, mechanics, and animal husbandry. The APS continued to thrive by maintaining a steady Membership.
Initially the APS met in Carpenters’ Hall or in Franklin’s own home. By 1783, however, the Society needed a building of its own. The building you are standing in, Philosophical Hall, was completed in 1789.